I currently have a gas box heater as back up heat for our small house (under 1000, inc. basement). It works ok, at 35,000 btus will heat the house when callled upon. Live pilot and inefficient, though, and ugly. Any suggestions? Things I've found online: Lennox Vision Enviro Cara Hearthston and Heat and Glo and Scan all make very pricey versions- probably too much. But looking for rs a nice minimal thing. Looked at the Lopi Berkshire- bigger footprint, older style, anyu good? Will any of these be substantially more efficient? The current one is about 20 yrs. old. I use propane. Any thoughts appreciated.